EP0389310A2 - Potentiometric sensor - Google Patents

Potentiometric sensor Download PDF

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Publication number
EP0389310A2
EP0389310A2 EP90400425A EP90400425A EP0389310A2 EP 0389310 A2 EP0389310 A2 EP 0389310A2 EP 90400425 A EP90400425 A EP 90400425A EP 90400425 A EP90400425 A EP 90400425A EP 0389310 A2 EP0389310 A2 EP 0389310A2
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EP
European Patent Office
Prior art keywords
tracks
sensor
segments
track
resistive
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Granted
Application number
EP90400425A
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German (de)
French (fr)
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EP0389310B1 (en
EP0389310A3 (en
Inventor
Laurent Marcuzzi
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Automobiles Peugeot SA
Automobiles Citroen SA
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Automobiles Peugeot SA
Automobiles Citroen SA
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Publication of EP0389310A3 publication Critical patent/EP0389310A3/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/16—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance
    • G01D5/165—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance by relative movement of a point of contact or actuation and a resistive track

Definitions

  • the present invention relates to an improved potentiometric sensor.
  • Such sensors can be used in particular in the automotive industry and are intended, for example, to be mounted on a steering rack or on a steering assistance cylinder of a vehicle.
  • the sensors currently used to measure the steering angle of the wheels are rotary opto-electronic type sensors mounted on the steering column.
  • linear displacement sensors capable of being mounted on a rack.
  • These sensors are generally linear potentiometers with very poor resolution, because at automobile prices, the characteristics of the resistive tracks do not allow working, when processing the output signals of these sensors, with more than 7 bits (resolution of 11 ° on the steering wheel), linear opto-electronic sensors which do not allow absolute measurement and are sensitive to high temperatures and finally sensors with differential transformers of very high price and requiring associated electronics complex.
  • This sensor comprises a sensor housing in which are arranged at least two electrically conductive tracks, associated, one of which has resistive characteristics and the other is a signal output collecting track, opposite which is mounted movable a connecting wiper carried by a slider which can be moved in the housing by means of an operating rod.
  • the senor described in this document has a large number of tracks and therefore of sliders resulting in an increase in the size, the price and the weight of this sensor, which presents problems of integration in large series in motor vehicles. .
  • the object of the invention is therefore to solve the problems mentioned above by proposing a potentiometric sensor which is simple, reliable and of a low cost and size.
  • the invention relates to an improved potentiometric sensor of the type comprising a sensor housing in which are arranged at least two electrically conductive tracks, associated, one of which has resistive characteristics and the other is a signal output collecting track, facing which is movably mounted a connecting wiper carried by a cursor movable in the housing by means of an operating rod, characterized in that the track having resistive characteristics comprises at least two distinct resistive segments, in that one terminal of the electricity supply of the or each track having resistive characteristics is connected to the midpoint between the segments of this track and the other terminal, at the ends of the latter, and in that it comprises two sets of associated tracks opposite each of which is disposed a wiper carried by the cursor, the resistive segments of the tracks having resistive characteristics being offset along the length of the sensor housing.
  • a potentiometric sensor is of the type comprising a sensor housing 1 in which are arranged at least two electrically conductive tracks, associated, and referenced for example 2 and 3 in this figure.
  • two sets of associated tracks are arranged in this sensor housing.
  • the first set of tracks is made up of tracks 2 and 3, while the second set of tracks is made up of tracks 4 and 5. These sets of tracks are arranged in parallel on either side of the axis of symmetry of the sensor.
  • One of the tracks in each game for example tracks 3 and 5, has specific characteristics. sistives which will be described in more detail below, while the other track of each set, like tracks 2 and 4, is a signal output collecting track, in S1 and S2 respectively.
  • a wiper 6, 7 is arranged opposite the associated tracks of each set, so as to electrically connect the points of the associated tracks, facing each other. These wipers are carried by a slider 8 mounted movable along the length of the sensor housing 1 by means of an operating rod 9.
  • each track having resistive characteristics that is to say tracks 3 and 5
  • a terminal of the electricity supply of each of the tracks having resistive characteristics is connected to the midpoint, respectively A and B, between the segments of each track, while the other terminal of the electricity supply is connected to the ends of the track concerned.
  • points A and B can be connected to a voltage of + 5 V, while the ends of the tracks are connected to 0 V of the power supply.
  • the resistive segments of tracks 3 and 5 are offset along the length of the sensor housing, and overlap at their ends so as to obtain a position signal in S1 or S2 , over the entire movement of the cursor in the sensor housing.
  • the segments of one or each track also have different lengths.
  • the segments 3a and 5b are longer than the segments 5a and 3b, the longest segments being arranged at the opposite ends of the tracks, which makes it possible to obtain different resolutions of the sensor in different ranges of rotation of the steering wheel, and more particularly to improve this resolution around the straight line materialized by the reference LD in this figure.
  • the length of the sensor can be divided into three zones, a zone extending between more or less 125 ° rotation of the steering wheel around the straight line referenced LD in this figure and in which the resolution of the sensor is 1 ° of rotation of the steering wheel. On either side of this area are provided areas of lower resolution, for example of 5 ° rotation of the steering wheel.
  • Fig. 2 which represents the output signals S1 and S2 of the collector tracks of the sensor according to the invention, as a function of the angle of rotation of the steering wheel, if we assume that the steering wheel makes four turns from stop to stop, it can be seen that the level of the signal S1 from the left has a first ascending slope, corresponding to the passage of the wiper 6 on the collecting track 2 and the resistive segment 3a of the track 3, up to 'at a 5 V level. This level corresponds to the passage of the wiper 6 on the conductive part of the track 3 connecting the resistive segments 3a and 3b thereof.
  • the wiper 7 also passes over segment 5a of track 5 and track 4, so that the level of the output signal S2 increases to a level of 5 V.
  • the wiper 6 After passing over the conductive part connecting the segments 3a and 3b of the track 3, the wiper 6 passes over the segment 3b, so that the level of the output voltage S1 decreases to 0 V.
  • the level of signal S2 also decreases, when the wiper 7 passes over segment 5b of track 5.
  • the sensor according to the invention therefore allows an absolute measurement of displacement and has good resolution in the area around the straight line.
  • the resolution can be adjusted to a sufficient value, for example 5 ° of rotation of the steering wheel, because this angle is not reached only at very low speeds.
  • this sensor is simplified compared to a rotary sensor mounted on the steering column as was the case in the prior art.

Abstract

The potentiometric sensor is improved, of the type consisting of a sensor casing (1) containing at least two associated electrically conducting rails (2, 3; 4, 5). One (3; 5) of the rails has resistive properties and the other (2; 4) is a rail for collecting the signal output. A sliding contact (6; 7) carried by a wiper arm (8) is mounted displaceably opposite the rails. The wiper arm can be moved in the casing (1) by means of a manoeuvring rod (9). The characteristic feature is that the rail (3; 5) with resistive properties has at least two distinct resistive segments (3a, 3b; 5a, 5b). <IMAGE>

Description

La présente invention concerne un capteur potentiométrique perfectionné.The present invention relates to an improved potentiometric sensor.

De tels capteurs peuvent être utilisés notamment dans l'industrie automobile et sont destinés par exemple à être montés sur une crémaillère de di­rection ou sur un vérin d'assistance de direction d'un véhicule.Such sensors can be used in particular in the automotive industry and are intended, for example, to be mounted on a steering rack or on a steering assistance cylinder of a vehicle.

Dans ce cas, ils doivent permettre une mesu­re précise et absolue du déplacement de la crémaillère donc de l'angle de braquage des roues et de la vitesse de déplacement de celle-ci.In this case, they must allow a precise and absolute measurement of the movement of the rack, therefore of the steering angle of the wheels and of the speed of movement thereof.

Les capteurs utilisés actuellement pour mesurer l'angle de braquage des roues sont des cap­teurs rotatifs du type opto-électronique montés sur la colonne de direction.The sensors currently used to measure the steering angle of the wheels are rotary opto-electronic type sensors mounted on the steering column.

Ces capteurs présentent un certain nombre d'inconvénients, parmi lesquels une mauvaise résolu­tion à prix automobile. De plus, ils ne permettent pas de mesurer une position absolue, sont d'un montage difficile et sont très sensibles aux poussières et aux températures élevées.These sensors have a number of drawbacks, including poor resolution at automotive prices. In addition, they do not allow absolute position measurement, are difficult to assemble and are very sensitive to dust and high temperatures.

Par ailleurs, il existe également des cap­teurs de déplacement linéaires susceptibles d'être montés sur crémaillère. Ces capteurs sont en général des potentiomètres linéaires présentant une très mauvaise résolution, car à prix automobile, les caractéristiques des pistes résistives ne permettent pas de travailler, lors du traitement des signaux de sortie de ces capteurs, avec plus de 7 bits (résolu­tion de 11° au volant), des capteurs opto-électroni­ques linéaires qui ne permettent pas de mesure absolue et sont sensibles aux températures élevées et enfin des capteurs à transformateurs différentiels de prix très élevé et nécessitant une électronique associée complexe.Furthermore, there are also linear displacement sensors capable of being mounted on a rack. These sensors are generally linear potentiometers with very poor resolution, because at automobile prices, the characteristics of the resistive tracks do not allow working, when processing the output signals of these sensors, with more than 7 bits (resolution of 11 ° on the steering wheel), linear opto-electronic sensors which do not allow absolute measurement and are sensitive to high temperatures and finally sensors with differential transformers of very high price and requiring associated electronics complex.

On connait également d'après le document FR-A-2 570 177, un organe de détection de position pour une partie mobile dans un véhicule automobile.Also known from document FR-A-2 570 177 is a position detection member for a moving part in a motor vehicle.

Ce capteur comporte un boîtier de capteur dans lequel sont disposées au moins deux pistes con­ductrices de l'électricité, associées, dont l'une présente des caractéristiques résistives et l'autre est une piste collectrice de sortie de signaux, en regard desquelles est monté déplaçable un frotteur de liaison porté par un curseur déplaçable dans le boîtier par l'intermédiaire d'une tige de manoeuvre.This sensor comprises a sensor housing in which are arranged at least two electrically conductive tracks, associated, one of which has resistive characteristics and the other is a signal output collecting track, opposite which is mounted movable a connecting wiper carried by a slider which can be moved in the housing by means of an operating rod.

Cependant, le capteur décrit dans ce docu­ment comporte un grand nombre de pistes et donc de curseurs entraînant une augmentation de l'encombre­ment, du prix et du poids de ce capteur, ce qui présente des problèmes d'intégration en grande série dans les véhicules automobiles.However, the sensor described in this document has a large number of tracks and therefore of sliders resulting in an increase in the size, the price and the weight of this sensor, which presents problems of integration in large series in motor vehicles. .

Le but de l'invention est donc de résoudre les problèmes évoqués ci-dessus en proposant un cap­teur potentiométrique qui soit simple, fiable et d'un prix de revient et d'un encombrement peu élevés.The object of the invention is therefore to solve the problems mentioned above by proposing a potentiometric sensor which is simple, reliable and of a low cost and size.

A cet effet,l'invention a pour objet un capteur potentiométrique perfectionné du type com­portant un boîtier de capteur dans lequel sont dis­posées au moins deux pistes conductrices de l'élec­tricité, associées, dont l'une présente des carac­téristiques résistives et l'autre est une piste col­lectrice de sortie de signaux, en regard desquelles est monté déplaçable un frotteur de liaison porté par un curseur déplaçable dans le boîtier par l'intermé­diaire d'une tige de manoeuvre, caractérisé en ce que la piste présentant des caractéristiques résistives comporte au moins deux segments résistifs distincts, en ce qu'une borne de l'alimentation en électricité de la ou chaque piste présentant des caractéristiques résistives est reliée au point milieu entre les segments de cette piste et l'autre borne, aux extré­mités de celle-ci, et en ce qu'il comporte deux jeux de pistes associées en regard de chacun desquels est disposé un frotteur porté par le curseur, les segments résistifs des pistes présentant des caractéristiques résistives étant décalés suivant la longueur du boî­tier du capteur.To this end, the invention relates to an improved potentiometric sensor of the type comprising a sensor housing in which are arranged at least two electrically conductive tracks, associated, one of which has resistive characteristics and the other is a signal output collecting track, facing which is movably mounted a connecting wiper carried by a cursor movable in the housing by means of an operating rod, characterized in that the track having resistive characteristics comprises at least two distinct resistive segments, in that one terminal of the electricity supply of the or each track having resistive characteristics is connected to the midpoint between the segments of this track and the other terminal, at the ends of the latter, and in that it comprises two sets of associated tracks opposite each of which is disposed a wiper carried by the cursor, the resistive segments of the tracks having resistive characteristics being offset along the length of the sensor housing.

L'invention sera mieux comprise à l'aide de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés, sur lesquels :

  • - la Fig.1 représente une vue schématique en coupe d'un capteur selon l'invention; et
  • - la Fig.2 représente des signaux obtenus aux sorties d'un capteur selon l'invention.
The invention will be better understood with the aid of the description which follows, given solely by way of example and made with reference to the appended drawings, in which:
  • - Fig.1 shows a schematic sectional view of a sensor according to the invention; and
  • - Fig.2 shows signals obtained at the outputs of a sensor according to the invention.

Ainsi qu'on peut le voir sur la Fig.1, un capteur potentiométrique selon l'invention, est du type comportant un boîtier de capteur 1 dans lequel sont disposées au moins deux pistes conductrices de l'électricité, associées, et référencées par exemple 2 et 3 sur cette figure.As can be seen in Fig. 1, a potentiometric sensor according to the invention is of the type comprising a sensor housing 1 in which are arranged at least two electrically conductive tracks, associated, and referenced for example 2 and 3 in this figure.

Dans le mode de réalisation représenté, deux jeux de pistes associées sont disposés dans ce boîtier de capteur.In the embodiment shown, two sets of associated tracks are arranged in this sensor housing.

Le premier jeu de pistes est constitué par les pistes 2 et 3, tandis que le second jeu de pistes est constitué par les pistes 4 et 5. Ces jeux de pis­tes sont disposés parallèlement de part et d'autre de l'axe de symétrie du capteur .The first set of tracks is made up of tracks 2 and 3, while the second set of tracks is made up of tracks 4 and 5. These sets of tracks are arranged in parallel on either side of the axis of symmetry of the sensor.

L'une des pistes de chaque jeu, par exemple les pistes 3 et 5, présente des caractéristiques ré­ sistives qui seront décrites plus en détail par la suite, tandis que l'autre piste de chaque jeu, comme les pistes 2 et 4, est une piste collectrice de sortie de signaux, en S1 et S2 respectivement.One of the tracks in each game, for example tracks 3 and 5, has specific characteristics. sistives which will be described in more detail below, while the other track of each set, like tracks 2 and 4, is a signal output collecting track, in S1 and S2 respectively.

Un frotteur 6, 7 est disposé en regard des pistes associées de chaque jeu, de manière à relier électriquement les points des pistes associées, en regard les uns des autres. Ces frotteurs sont portés par un curseur 8 monté déplaçable suivant la longueur du boîtier de capteur 1 par l'intermédiaire d'une tige de manoeuvre 9.A wiper 6, 7 is arranged opposite the associated tracks of each set, so as to electrically connect the points of the associated tracks, facing each other. These wipers are carried by a slider 8 mounted movable along the length of the sensor housing 1 by means of an operating rod 9.

Selon l'invention, chaque piste présentant des caractéristiques résistives, c'est à dire les pistes 3 et 5, présente au moins deux segments ré­sistifs distincts référencés respectivement 3a et 3b et 5a et 5b sur cette figure.According to the invention, each track having resistive characteristics, that is to say tracks 3 and 5, has at least two distinct resistive segments referenced respectively 3a and 3b and 5a and 5b in this figure.

Une borne de l'alimentation en électricité de chacune des pistes présentant des caractéristiques résistives est reliée au point milieu, respectivement A et B, entre les segments de chaque piste, tandis que l'autre borne de l'alimentation en électricité est reliée aux extrémités de la piste concernée.A terminal of the electricity supply of each of the tracks having resistive characteristics is connected to the midpoint, respectively A and B, between the segments of each track, while the other terminal of the electricity supply is connected to the ends of the track concerned.

Ainsi par exemple, les points A et B peuvent être reliés à une tension de + 5 V, tandis que les ex­trémités des pistes sont reliées au 0 V de l'alimenta­tion.Thus, for example, points A and B can be connected to a voltage of + 5 V, while the ends of the tracks are connected to 0 V of the power supply.

Avantageusement également, et comme on peut le voir sur cette figure, les segments résistifs des pistes 3 et 5 sont décalés suivant la longueur du boîtier de capteur, et se chevauchent à leurs extrémi­tés de manière à obtenir un signal de position en S1 ou en S2, sur la totalité du déplacement du curseur dans le boîtier du capteur.Advantageously also, and as can be seen in this figure, the resistive segments of tracks 3 and 5 are offset along the length of the sensor housing, and overlap at their ends so as to obtain a position signal in S1 or S2 , over the entire movement of the cursor in the sensor housing.

L'alimentation et la disposition des seg­ ments, décrites précédemment, permettent d'obtenir une mesure de déplacement absolue.Food and arrangement of seg ment, described above, make it possible to obtain an absolute displacement measurement.

Les segments de l'une ou de chaque piste présentent également des longueurs différentes.The segments of one or each track also have different lengths.

Ainsi par exemple, les segments 3a et 5b sont plus longs que les segments 5a et 3b, les segments les plus longs étant disposés aux extrémi­tés opposées des pistes, ce qui permet d'obtenir différentes résolutions du capteur dans différentes plages de rotation du volant, et plus particulièment d'améliorer cette résolution autour de la ligne droite matérialisée par la référence LD sur cette figure.Thus, for example, the segments 3a and 5b are longer than the segments 5a and 3b, the longest segments being arranged at the opposite ends of the tracks, which makes it possible to obtain different resolutions of the sensor in different ranges of rotation of the steering wheel, and more particularly to improve this resolution around the straight line materialized by the reference LD in this figure.

Ainsi par exemple, comme cela est illustré sur cette Fig.1, la longueur du capteur peut être découpée en trois zones, une zone s'étendant entre plus ou moins 125° de rotation du volant autour de la ligne droite référencée LD sur cette figure et dans laquelle la résolution du capteur est de 1° de rotation du volant. De part et d'autre de cette zone sont ménagées des zones de moins bonne résolution par exemple de 5° de rotation du volant.So for example, as illustrated in this Fig. 1, the length of the sensor can be divided into three zones, a zone extending between more or less 125 ° rotation of the steering wheel around the straight line referenced LD in this figure and in which the resolution of the sensor is 1 ° of rotation of the steering wheel. On either side of this area are provided areas of lower resolution, for example of 5 ° rotation of the steering wheel.

Comme on peut le voir sur la Fig.2, qui re­présente les signaux de sortie S1 et S2 des pistes collectrices du capteur selon l'invention, en fonction de l'angle de rotation du volant, si on prend comme hypothèse que le volant fait quatre tours de butée à butée, on peut constater que le niveau du signal S1 en partant de la gauche, présente une première pente ascendante, correspondant au passage du frotteur 6 sur la piste collectrice 2 et le segment résistif 3a de la piste 3, jusqu'à un palier à 5 V. Ce palier correspond au passage du frotteur 6 sur la partie conductrice de la piste 3 reliant les segments résistifs 3a et 3b de celle-ci.As can be seen in Fig. 2, which represents the output signals S1 and S2 of the collector tracks of the sensor according to the invention, as a function of the angle of rotation of the steering wheel, if we assume that the steering wheel makes four turns from stop to stop, it can be seen that the level of the signal S1 from the left has a first ascending slope, corresponding to the passage of the wiper 6 on the collecting track 2 and the resistive segment 3a of the track 3, up to 'at a 5 V level. This level corresponds to the passage of the wiper 6 on the conductive part of the track 3 connecting the resistive segments 3a and 3b thereof.

Lors de ce déplacement, le frotteur 7 passe également sur le segment 5a de la piste 5 et la piste 4, de sorte que le niveau du signal de sortie S2 pro­gresse jusqu'à un palier de 5 V.During this movement, the wiper 7 also passes over segment 5a of track 5 and track 4, so that the level of the output signal S2 increases to a level of 5 V.

Après le passage sur la partie conductrice reliant les segments 3a et 3b de la piste 3, le frot­teur 6 passe sur le segment 3b, de sorte que le niveau de la tension de sortie S1 décroit jusqu'à 0 V.After passing over the conductive part connecting the segments 3a and 3b of the track 3, the wiper 6 passes over the segment 3b, so that the level of the output voltage S1 decreases to 0 V.

Après un palier à 5 V, le niveau du signal S2 décroit également, lors du passage du frotteur 7 sur le segment 5b de la piste 5.After a plateau at 5 V, the level of signal S2 also decreases, when the wiper 7 passes over segment 5b of track 5.

On conçoit qu'il est possible de caractéri­ser les pentes, les résolutions de même que la lon­gueur des paliers des signaux de sortie d'un tel capteur, en ajustant les caractéristiques des segments des pistes 3 et 5.It is understood that it is possible to characterize the slopes, the resolutions as well as the length of the stages of the output signals of such a sensor, by adjusting the characteristics of the segments of tracks 3 and 5.

Le capteur selon l'invention permet donc une mesure absolue de déplacement et présente une bonne résolution dans la zone autour de la ligne droite.The sensor according to the invention therefore allows an absolute measurement of displacement and has good resolution in the area around the straight line.

En dehors de cette zone, c'est à dire au-­delà d'un angle de ± 125°, la résolution peut être ajustée à une valeur suffisante, par exemple de 5° de rotation du volant, car cet angle n'est atteint qu'à de très faibles vitesses.Outside this area, i.e. beyond an angle of ± 125 °, the resolution can be adjusted to a sufficient value, for example 5 ° of rotation of the steering wheel, because this angle is not reached only at very low speeds.

Par ailleurs, le montage de ce capteur est simplifié par rapport à un capteur rotatif monté sur la colonne de direction comme c'était le cas dans l'état de la technique.Furthermore, the mounting of this sensor is simplified compared to a rotary sensor mounted on the steering column as was the case in the prior art.

Le problème d'encombrement ne se pose plus au niveau de la crémaillère ou du vérin d'assistance de direction.The space requirement no longer arises in the rack or the steering assistance cylinder.

Enfin, il est également possible de mémori­ser la position de la ligne droite, un calculateur électronique relié aux sorties S1 et S2, disposant de cette ligne droite dès le démarrage du véhicule.Finally, it is also possible to memorize the position of the straight line, an electronic computer connected to outputs S1 and S2, having this straight line from the start of the vehicle.

Claims (4)

1. Capteur potentiométrique perfectionné du type comportant un boîtier de capteur (1) dans lequel sont disposées au moins deux pistes (2,3; 4,5) con­ductrices de l'électricité, associées, dont l'une (3; 5) présente des caractéristiques résistives et l'autre (2; 4) est une piste collectrice de sortie de signaux, en regard desquelles est monté déplaçable un frotteur de liaison (6; 7) porté par un curseur (8) déplaçable dans le boîtier (1) par l'intermédiaire d'une tige de manoeuvre (9), caractérisé en ce que la piste (3;5) présentant des caractéristiques résistives comporte au moins deux segments résistifs distincts (3a,3b; 5a, 5b), en ce qu'une borne de l'alimentation en électri­cité de la ou chaque piste présentant des caractéris­tiques résistives est reliée au point milieu (A,B) entre les segments de cette piste et l'autre borne, aux extrémités de celle-ci, et en ce qu'il comporte deux jeux de pistes associées (2,3; 4,5) en regard de chacun desquels est disposé un frotteur (6;7) porté par le curseur (8), les segments résistifs des pistes présentant des caractéristiques résistives étant décalés suivant la longueur du boîtier (1) du capteur.1. Improved potentiometric sensor of the type comprising a sensor housing (1) in which are arranged at least two tracks (2,3; 4,5) electrically conductive, associated, one of which (3; 5) has resistive characteristics and the other (2; 4) is a signal output collecting track, opposite which is movably mounted a bonding shoe (6; 7) carried by a cursor (8) movable in the housing (1) by means of an operating rod (9), characterized in that the track (3; 5) having resistive characteristics comprises at least two distinct resistive segments (3a, 3b; 5a, 5b), in that one terminal of the electricity supply to the or each track having resistive characteristics is connected to the midpoint (A, B) between the segments of this track and the other terminal, at the ends thereof, and in that '' it has two sets of associated tracks (2,3; 4,5) next to each of which is disposed a wiper (6; 7) carried by the cursor (8), the resistive segments of the tracks having resistive characteristics being offset along the length of the housing (1) of the sensor. 2. Capteur selon la revendication 1, carac­térisé en ce que les segments résistifs des pistes (3;5) se chevauchent à leurs extrémités suivant la longueur du capteur.2. Sensor according to claim 1, characterized in that the resistive segments of the tracks (3; 5) overlap at their ends along the length of the sensor. 3. Capteur selon l'une quelconque des re­vendications précédentes, caractérisé en ce que les segments (3a,3b; 5a, 5b) de l'une ou de chaque piste (3,5) présentent des longueurs différentes.3. Sensor according to any one of the preceding claims, characterized in that the segments (3a, 3b; 5a, 5b) of one or each track (3,5) have different lengths. 4. Capteur selon la revendication 3, ca­ractérisé en ce que les segments (3a; 5b) de plus grande longueur sont disposés aux extrémités oppo­sées des pistes.4. Sensor according to claim 3, characterized in that the segments (3a; 5b) of greater length are arranged at the opposite ends of the tracks.
EP19900400425 1989-03-13 1990-02-15 Potentiometric sensor Expired - Lifetime EP0389310B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8903242A FR2644247B1 (en) 1989-03-13 1989-03-13 IMPROVED POTENTIOMETRIC SENSOR
FR8903242 1989-03-13

Publications (3)

Publication Number Publication Date
EP0389310A2 true EP0389310A2 (en) 1990-09-26
EP0389310A3 EP0389310A3 (en) 1990-12-19
EP0389310B1 EP0389310B1 (en) 1992-11-04

Family

ID=9379615

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900400425 Expired - Lifetime EP0389310B1 (en) 1989-03-13 1990-02-15 Potentiometric sensor

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Country Link
EP (1) EP0389310B1 (en)
DE (1) DE69000422T2 (en)
FR (1) FR2644247B1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2090842A5 (en) * 1970-05-27 1972-01-14 Preh Elektro Feinmechanik
DE2654238A1 (en) * 1976-11-30 1978-06-01 Albrecht Broemme Angle of rotation measuring circuit - uses HF triangular voltage supplies and scans contactless resistance ring
JPS59216201A (en) * 1983-05-25 1984-12-06 Sony Corp Presettable control circuit
FR2570177A1 (en) * 1984-09-13 1986-03-14 Bosch Gmbh Robert POSITIONS DETECTION DEVICE FOR A MOBILE PART IN A MOTOR VEHICLE
US4631540A (en) * 1985-06-03 1986-12-23 Sperry Corporation Angular position to linear voltage converter
WO1987006689A1 (en) * 1986-04-25 1987-11-05 Robert Bosch Gmbh Device for detecting the position of a moving part in a motor vehicle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2090842A5 (en) * 1970-05-27 1972-01-14 Preh Elektro Feinmechanik
DE2654238A1 (en) * 1976-11-30 1978-06-01 Albrecht Broemme Angle of rotation measuring circuit - uses HF triangular voltage supplies and scans contactless resistance ring
JPS59216201A (en) * 1983-05-25 1984-12-06 Sony Corp Presettable control circuit
FR2570177A1 (en) * 1984-09-13 1986-03-14 Bosch Gmbh Robert POSITIONS DETECTION DEVICE FOR A MOBILE PART IN A MOTOR VEHICLE
US4631540A (en) * 1985-06-03 1986-12-23 Sperry Corporation Angular position to linear voltage converter
WO1987006689A1 (en) * 1986-04-25 1987-11-05 Robert Bosch Gmbh Device for detecting the position of a moving part in a motor vehicle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 86 (P-349)[1089], 16 avril 1985; & JP-A-59 216 201 (SONY K.K.) 06-12-1984 *

Also Published As

Publication number Publication date
FR2644247A1 (en) 1990-09-14
EP0389310B1 (en) 1992-11-04
DE69000422T2 (en) 1993-05-19
DE69000422D1 (en) 1992-12-10
FR2644247B1 (en) 1991-09-13
EP0389310A3 (en) 1990-12-19

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